Bremsstrahlung trapezium rule bug

[Mateasek]

I think that here we have a bug in the trapezium evaluation, don't we?

core/cherab/core/model/plasma/bremsstrahlung.pyx

Line 77 in c47a09c

upper_wavelength = spectrum.min_wavelength + spectrum.delta_wavelength * i

I think that there should be (i + 1) term here, otherwise for the 1st iteration the lower_wavelength and upper_wavelength are equal, aren't they?

The line should look like:
upper_wavelength = spectrum.min_wavelength + spectrum.delta_wavelength * (i + 1)

[vsnever]

Hi @Mateasek, yes you are right. I fixed this in #352, but we decided to refactor the atomic data repository before applying this PR. So this bug deserves a separate fix.

[Mateasek]

I suspected you fixed it somewhere @vsnever , but looked into wrong PRs.

[vsnever]

Fixed in #385.